Don't fail when np.intc != np.int32

Don't fail when np.intc != np.int32

np.intc (C int), np.int_ (C long) and np.longlong (C long long)
are always distinct type objects, but only two of them are
actually different sizes; np.int32 and np.int64 are aliases
https://sources.debian.org/src/numpy/1:1.18.4-1/numpy/core/_type_aliases.py/#L110

Author: Rebecca N. Palmer <rebecca_palmer@zoho.com>
Bug: https://github.com/pandas-dev/pandas/issues/31856
Forwarded: not-needed https://github.com/pandas-dev/pandas/pull/33729/commits/16600575b4a19ceb7ceabbec6992e932e797e109

Gbp-Pq: Name test_promote_32bit.patch